WO2023054463A1 - Film stratifié, stratifié optique et dispositif d'affichage d'image - Google Patents

Film stratifié, stratifié optique et dispositif d'affichage d'image Download PDF

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Publication number
WO2023054463A1
WO2023054463A1 PCT/JP2022/036149 JP2022036149W WO2023054463A1 WO 2023054463 A1 WO2023054463 A1 WO 2023054463A1 JP 2022036149 W JP2022036149 W JP 2022036149W WO 2023054463 A1 WO2023054463 A1 WO 2023054463A1
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Prior art keywords
layer
film
optical
less
laminated film
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PCT/JP2022/036149
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English (en)
Japanese (ja)
Inventor
彰二 祖父江
貴志 白石
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住友化学株式会社
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Priority to CN202280066489.5A priority Critical patent/CN118043708A/zh
Publication of WO2023054463A1 publication Critical patent/WO2023054463A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Definitions

  • the present invention relates to a laminated film, an optical laminate and an image display device.
  • a circular polarizer is an optical laminate that includes a linear polarizer and a retardation layer.
  • a circularly polarizing plate is usually arranged on the viewing side of an image display element such as an organic EL display element.
  • an image display element such as an organic EL display element.
  • An optical member such as a circularly polarizing plate arranged on the viewing side of an image display element is required to be able to adjust the reflection hue according to needs while maintaining a low reflectance.
  • An object of the present invention is to provide a laminated film for constituting an optical laminate together with a circularly polarizing plate by arranging it on the viewing side of the circularly polarizing plate, wherein the optical laminate maintains a low reflectance of the optical laminate.
  • An object of the present invention is to provide a laminated film capable of adjusting the reflection hue of the laminated body.
  • Another object of the present invention is to provide an optical layered body including the layered film and the circularly polarizing plate, and an image display device including the optical layered body.
  • the present invention provides the following laminated film, optical laminate and image display device.
  • a laminated film comprising a substrate film and an optical function layer (A) laminated thereon, The laminated film has a luminous reflectance Y of 9.0% or less, a reflection hue a* of 0.3 or more and 7.0 or less, and a reflection hue b* of ⁇ 10.0 or more and 0 or less.
  • Laminated film [2] The laminated film according to [1], wherein the optical function layer (A) has a refractive index of 1.55 or more and 1.68 or less.
  • the optical function layer (A) contains zirconium oxide particles, The laminated film according to any one of [1] to [4], wherein in the primary particle size distribution of the zirconium oxide particles, the particle size range of 0.1 nm to 15 nm accounts for 90% or more.
  • An adjustable laminated film, an optical laminated body including the laminated film and a circularly polarizing plate, and an image display device including the optical laminated body can be provided.
  • FIG. 4 is a schematic cross-sectional view showing another example of the laminated film according to the present invention
  • FIG. 4 is a schematic cross-sectional view showing still another example of the laminated film according to the present invention
  • FIG. 4 is a schematic cross-sectional view showing still another example of the laminated film according to the present invention
  • 1 is a schematic cross-sectional view showing an example of an optical layered body according to the present invention
  • FIG. 4 is a schematic cross-sectional view showing another example of the optical layered body according to the present invention
  • FIG. 4 is a schematic cross-sectional view showing another example of the optical layered body according to the present invention
  • FIG. 4 is a schematic cross-sectional view showing still another example of the optical layered body according to the present invention.
  • FIG. 4 is a schematic cross-sectional view showing still another example of the optical layered body according to the present invention;
  • FIG. 4 is a schematic cross-sectional view showing still another example of the optical layered body according to the present invention;
  • 1 is a schematic cross-sectional view showing an example of an image display device according to the present invention;
  • laminated film according to the present invention is a laminated optical film including a substrate film and an optical functional layer (A) laminated thereon. Examples of the layer structure of the laminated film are shown in FIGS. 1 to 4. FIG.
  • the laminated film shown in FIG. 1 is composed of a base film 1b and an optical function layer (A) 1a laminated thereon, and the base film 1b and the optical function layer (A) 1a are in contact with each other. ing.
  • the laminated film shown in FIG. 2 has the same configuration as the laminated film shown in FIG. 1 except that it further includes a resin layer 1c arranged on the opposite side of the base film 1b in the optical function layer (A) 1a. have.
  • the optical function layer (A) 1a and the resin layer 1c are in contact with each other.
  • the laminated film shown in FIG. 3 has the same configuration as the laminated film shown in FIG. 1 except that it has an intervening layer 1d between the base film 1b and the optical function layer (A) 1a.
  • the optical functional layer (A) 1a and the intervening layer 1d are in contact, and the intervening layer 1d and the base film 1b are in contact.
  • the laminated film shown in FIG. 4 has a resin layer 1c arranged on the opposite side of the base film 1b in the optical function layer (A) 1a, and further includes the base film 1b and the optical function layer (A) 1a. It has the same configuration as the laminated film shown in FIG.
  • the optical functional layer (A) 1a and the resin layer 1c are in contact, the optical functional layer (A) 1a and the intervening layer 1d are in contact, and the intervening layer 1d and the base film 1b are in contact.
  • a laminated film is used in combination with a circularly polarizing plate.
  • the term "circular polarizer" includes elliptical polarizers.
  • a laminate that is a combination of a laminate film and a circularly polarizing plate is referred to as an optical laminate.
  • the laminated film is laminated on the viewing side of the circularly polarizing plate.
  • To be laminated on the viewing side means to be laminated on the surface of the linearly polarizing plate in the circularly polarizing plate including the linearly polarizing plate and the retardation layer.
  • the laminated film is laminated on the circularly polarizing plate, for example, so that the base film side faces the circularly polarizing plate.
  • the optical layered body can be suitably applied to an image display device such as an organic EL display device.
  • an image display device such as an organic EL display device.
  • the laminated film side of the optical laminate is on the viewing side, that is, so that the retardation layer side of the optical laminate is on the image display element (organic EL display element etc.) side. It is arranged on the viewing side of the image display element.
  • the laminated film has a luminous reflectance Y of 9.0% or less, a reflection hue a* of 0.3 or more and 7.0 or less, and a reflection hue b* of ⁇ 10.0 or more and 0 or less. .
  • the laminated film having the above optical properties by laminating this on the viewing side of the circularly polarizing plate, it is possible to adjust and control the reflection hue of the optical laminated body regardless of the configuration and retardation characteristics of the circularly polarizing plate. becomes.
  • the laminated film since the laminated film has a reflection hue b* of ⁇ 10.0 or more and 0 or less, the reflected light reflected on the viewer-side surface of the optical laminate can be bluish. This is advantageous in making it difficult to visually recognize color unevenness of internally reflected light due to slight fluctuations in the reflected hue within the plane of the circularly polarizing plate.
  • a conventional circular polarizer especially when it includes a ⁇ /4 layer with reverse wavelength dispersion, suppresses internal reflected light over a wide visible range, resulting in black display (the reflection hue of the circular polarizer is neutral). ) is easy to realize.
  • the more neutral the reflected hue of the circularly polarizing plate becomes the more easily the color unevenness becomes visible.
  • this color unevenness can be made difficult to see.
  • the transmitted light (white display) from the image display element does not change to a bluish color, and the reflectance does not increase significantly. .
  • the laminated film can play the role of adjusting the reflection hue of the optical laminated body. It is also possible to make the reflection hue of the circularly polarizing plate bluish by adjusting the wavelength dispersion and retardation characteristics of the retardation layer of the circularly polarizing plate. However, in this case, another problem arises in that the change in hue of the reflected light from an oblique angle becomes large. Moreover, in the first place, the range of reflected hues that can be adjusted by a technique for adjusting the wavelength dispersion and retardation characteristics of the retardation layer of the circularly polarizing plate is limited. According to the method of making the laminated film play the role of adjusting the reflected hue of the optical laminated body, it is possible to suppress the change in the reflected hue from an oblique direction and make the color unevenness less visible.
  • the reflection hue of the optical laminated body can be appropriately bluish, so that the display of the image display device can be given a high-class feeling.
  • the laminated film has a luminous reflectance Y of 9.0% or less, preferably 8.5% or less, more preferably 8.3% or less, still more preferably 8.2% or less, and even more preferably 8.2% or less. 0% or less. Thereby, the reflectance of the optical layered body can be appropriately reduced.
  • the luminous reflectance Y of the laminated film is usually more than 0%, preferably 5.0% or more, more preferably 5.5% or more, still more preferably 6.0% or more, and even more preferably 6.5%. % or more, particularly preferably 7.0% or more. When the luminous reflectance Y of the laminated film is within this range, it is possible to achieve both the function of adjusting the reflection hue of the optical layered body and the maintenance of low reflectance of the optical layered body.
  • the reflectance of the optical layered body is preferably 5.5% or less, more preferably 5.4% or less, and even more preferably 5.3% or less from the viewpoint of visibility of the image display device.
  • the reflectance of the optical stack is typically greater than 0%.
  • the laminated film has a reflective hue a* of 0.3 or more and 7.0 or less, and a reflective hue of neutral to slightly red is preferable to green. It is preferably 1.0 or more and 5.0 or less, more preferably 1.5 or more and 4.5 or less.
  • the laminated film has a reflection hue b* of -10.0 or more and 0 or less, and preferably -10. 0 or more and -0.5 or less, more preferably -9.0 or more and -1.0 or less, more preferably -8.0 or more and -2.0 or less, still more preferably -8.0 or more and -3.0 or less is.
  • the a* of the reflective hue of the optical layered body is preferably 0.0 or more and 2.0 or less, more preferably 0.2 or more and 1.8 or less. , more preferably 0.4 or more and 1.5 or less, still more preferably 0.6 or more and 1.4 or less.
  • the reflected hue b* is preferably ⁇ 5.0 or more and ⁇ 2.5 or less, more preferably ⁇ 4. 0.8 or more and -2.5 or less, more preferably -4.6 or more and -2.6 or less.
  • the reflectance of the optical laminate, the reflective hue of the laminated film, and the luminous reflectance Y can be measured according to the methods described in the section [Examples] below.
  • the optical functional layer (A) 1a includes, for example, a high refractive index layer, a dye-containing layer (e.g., a yellow dye-containing layer), alternating multilayers of high refractive index layers and low refractive index layers, a liquid crystal layer, a fluorescent layer, Or it may be a combination of these.
  • the high refractive index layer utilizes interface reflection to achieve the above reflective properties.
  • the dye-containing layer contains, for example, a dye that absorbs yellow light, and is a layer that enhances the bluishness of reflected light. Alternating multiple layers of high refractive index layers and low refractive index layers achieve the above reflection properties by utilizing interface reflection at the interface between the high refractive index layers and the low refractive index layers.
  • the liquid crystal layer achieves the above-described reflection characteristics by utilizing, for example, reflection of circularly polarized light by cholesteric liquid crystals.
  • the optical functional layer (A) having the above-described optical properties and the laminated film can be easily realized and manufactured, the reflection hue of the optical laminate can be easily adjusted, and an image display device can be used.
  • the optical function layer (A) 1a is preferably a high refractive index layer from the viewpoint that it is preferable not to color the light transmitted through the layer.
  • refractive index imparting agents include particles composed of metal oxides such as zirconium oxide, titanium oxide, tin oxide, zinc oxide, indium tin oxide, indium oxide, aluminum oxide, silicon oxide, yttrium oxide, and antimony oxide. mentioned.
  • the average particle size of the particles is, for example, 0.01 nm or more and 100 nm or less, preferably 0.1 nm or more and 50 nm or less.
  • the content of the refractive index imparting agent in the high refractive index layer is preferably 10% by mass or more and 90% by mass in 100% by mass of the high refractive index layer from the viewpoint of the refractive index of the high refractive index layer and the ease of film formation of the layer. % or less, more preferably 20 to 80 mass %, still more preferably 30 to 70 mass %, still more preferably 40 to 60 mass %.
  • the refractive index of the high refractive index layer can be adjusted by the content of the refractive index imparting agent in the high refractive index layer. The higher the content of the refractive index imparting agent in the high refractive index layer, the higher the refractive index of the high refractive index layer.
  • the binder resin may be a thermoplastic resin or a cured product of a curable resin.
  • the high refractive index layer may have a hard coat property.
  • the high refractive index layer is a composition for forming a hard coat layer containing an active energy ray-curable resin such as an ultraviolet curable resin and a refractive index imparting agent. It can be formed from a hardened material.
  • active energy ray-curable resins include (meth)acrylic resins, silicone-based resins, polyester-based resins, urethane-based resins, amide-based resins, epoxy-based resins, and the like, and UV-curable resins are preferred.
  • the ultraviolet curable resin that constitutes the binder resin is preferably a (meth)acrylic resin, and from the viewpoint of curability, more preferably a (meth)acrylic resin containing a structural unit derived from a polyfunctional (meth)acrylic monomer.
  • Resin. means either acrylic or methacrylic.
  • (Meth)" such as (meth)acrylate has the same meaning.
  • the thickness (optical film thickness) of the optical functional layer (A) 1a is preferably 10 nm or more and 1000 nm or less, more preferably 10 nm or more and 500 nm or less, still more preferably 20 nm or more and 300 nm or less, in order to realize the above optical properties of the laminated film. , still more preferably 40 nm or more and 250 nm or less, particularly preferably 100 nm or more and 200 nm or less, most preferably 150 nm or more and 200 nm or less.
  • the optical functional layer (A) 1a (preferably a high refractive index layer) preferably has a refractive index of 1.53 or more and 1.68 or less, more preferably 1.55, in order to achieve the above optical properties of the laminated film. 1.66 or less, more preferably 1.58 or more and 1.64 or less.
  • the refractive index of the optical functional layer (A) 1a can be measured according to the method described in the section [Examples] below.
  • the optical function layer (A) 1a is a high refractive index layer containing zirconium oxide particles as a refractive index imparting agent.
  • the volume average diameter (MV) of the zirconium oxide particles is preferably 1 nm or more and 50 nm or less, more preferably 3 nm or more and 20 nm or less so as not to impair the function of suppressing internal reflected light of the circularly polarizing plate.
  • the particle size range of 0.1 nm to 15 nm preferably accounts for 90% or more, more preferably 95% or more.
  • the primary particle size distribution is expressed by measuring the number of zirconium oxide particles.
  • the substrate film 1b is a substrate that supports the optical function layer (A) 1a.
  • a laminate film containing a substrate film and a high refractive index layer can be formed by applying a composition for forming a high refractive index layer onto a substrate film, and drying and/or curing as necessary. can.
  • a thermoplastic resin film which will be described later, can be used as the base film.
  • the thickness of the base film is usually 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, even more preferably 40 ⁇ m or less, and even more preferably 30 ⁇ m or less, from the viewpoint of thinning. , and is usually 5 ⁇ m or more, preferably 10 ⁇ m or more.
  • the base film is preferably a cyclic polyolefin resin film, a cellulose ester resin film, a polyester resin film, or a (meth)acrylic resin film.
  • the difference from the refractive index is preferably 0.05 or more and 0.20 or less, more preferably 0.07 or more and 0.18 or less, still more preferably 0.09 or more and 0.09 or less, in order to realize the above optical properties of the laminated film. 0.16 or less, even more preferably 0.09 or more and 0.14 or less, and may be 0.10 or less.
  • the laminated film can further include a resin layer 1c arranged on the opposite side of the base film 1b in the optical function layer (A) 1a.
  • the resin layer 1c include a bonding layer such as an adhesive layer, a hard coat layer, and the like.
  • the bonding layer can be used for laminating a front plate or the like on the viewing side of the optical function layer (A) 1a.
  • the pressure-sensitive adhesive layer the description in "(3) Pressure-sensitive adhesive layer" described later is cited.
  • the hard coat layer is, for example, a cured layer of an active energy ray-curable resin, preferably an ultraviolet-curable resin.
  • UV curable resins include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins, and olefin resins.
  • the hard coat layer may contain additives in order to improve strength.
  • the additive is not particularly limited, and may be inorganic fine particles, organic fine particles, or a mixture thereof.
  • the hard coat layer can contain an ultraviolet absorber.
  • ultraviolet absorbers include salicylate compounds, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds, nickel complex compounds, and the like. When there is absorption in the visible light region, the reflection hue becomes bluer, so there is an advantage that the refractive index of the optical function layer can be lowered.
  • the hard coat layer may be one that can be transferred from the substrate film.
  • the laminated film may have an intervening layer 1d between the base film 1b and the optical function layer (A) 1a.
  • the intervening layer 1d include a primer layer and a hard coat layer.
  • the laminated film may have both the resin layer 1c and the intervening layer 1d.
  • resins that form the primer layer include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins, and olefin resins.
  • the primer layer may contain additives.
  • the additive is not particularly limited, and inorganic fine particles, organic fine particles, or a mixture thereof may be added particularly to the primer layer for the purpose of improving adhesion and imparting slipperiness.
  • the hard coat layer the above description is cited.
  • the difference between the refractive index of the optical function layer (A) 1a and the intervening layer 1d is preferably 0.05 or more in order to realize the above optical properties of the laminated film. 0.20 or less, more preferably 0.07 or more and 0.18 or less, still more preferably 0.09 or more and 0.16 or less, still more preferably 0.09 or more and 0.14 or less, and 0.10 or less may
  • the intervening layer 1d can contain an ultraviolet absorber. Examples of UV absorbers are the same as above.
  • the intervening layer 1d is a hard coat layer containing an ultraviolet absorber.
  • An optical layered body according to the present invention (hereinafter also simply referred to as an "optical layered body”) includes the above-described laminated film and a circularly polarizing plate.
  • a circular polarizer includes a linear polarizer and a retardation layer.
  • the optical layered body includes a layered film, a linear polarizing plate and a retardation layer in this order.
  • the laminated film is laminated on the viewing side of the circularly polarizing plate.
  • To be laminated on the viewing side means to be laminated on the surface of the linearly polarizing plate in the circularly polarizing plate including the linearly polarizing plate and the retardation layer.
  • the laminated film is laminated on the circularly polarizing plate, for example, so that the base film side faces the circularly polarizing plate.
  • FIG. 5 is a schematic cross-sectional view showing an example of the optical layered body according to the present invention.
  • the optical layered body shown in FIG. 5 includes a layered film 1, a linear polarizing plate 2, and a retardation layer 3.
  • the laminated film 1 and the linear polarizing plate 2 can be laminated via the first bonding layer 10, and the linear polarizing plate 2 and the retardation layer 3 can be laminated via the second bonding layer 20. can be done.
  • the laminated film 1 can be laminated on the linear polarizing plate 2 via the first bonding layer 10 so that the base film side faces the linear polarizing plate 2 .
  • the optical laminated body of the present invention can have the following reflection characteristics [a] to [c].
  • the linear polarizing plate 2 contains a linear polarizer.
  • a linear polarizer has a function of selectively transmitting linearly polarized light in one direction from non-polarized light such as natural light.
  • Examples of the linear polarizer include a stretched film or layer to which a dichroic dye is adsorbed, a cured polymerizable liquid crystal compound and a cured liquid crystal layer containing a dichroic dye, and the like.
  • the laminated film 1 and the linear polarizing plate 2 can be laminated via the first bonding layer 10 .
  • a linear polarizer which is a stretched film to which a dichroic dye is adsorbed, is usually produced by uniaxially stretching a polyvinyl alcohol resin film and dyeing the polyvinyl alcohol resin film with a dichroic dye such as iodine. It can be produced through a step of adsorbing a dichroic dye, a step of treating a polyvinyl alcohol resin film on which the dichroic dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after treatment with the aqueous boric acid solution.
  • the thickness of the stretched film to which the dichroic dye is adsorbed is usually 30 ⁇ m or less, preferably 18 ⁇ m or less, more preferably 15 ⁇ m or less.
  • the thickness is usually 1 ⁇ m or more, and may be, for example, 5 ⁇ m or more.
  • Polyvinyl alcohol-based resin is obtained by saponifying polyvinyl acetate-based resin.
  • Polyvinyl acetate-based resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
  • Other monomers copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acid-based compounds, olefin-based compounds, vinyl ether-based compounds, unsaturated sulfone-based compounds, and (meth)acrylamide-based compounds having an ammonium group. .
  • the degree of saponification of the polyvinyl alcohol resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and aldehyde-modified polyvinyl formal, polyvinyl acetal, and the like can also be used.
  • the degree of polymerization of the polyvinyl alcohol resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
  • a linear polarizer which is a stretched layer to which a dichroic dye is adsorbed, is usually produced by applying a coating liquid containing the polyvinyl alcohol-based resin onto a substrate layer, uniaxially stretching the resulting laminate, and uniaxially stretching the laminate.
  • the substrate layer may be used as a protective film for the linear polarizer, or may be peeled off from the linear polarizer.
  • the material and thickness of the base layer may be the same as the material and thickness of the thermoplastic resin film, which will be described later.
  • the linear polarizing plate 2 can include a protective film laminated on one side or both sides of a linear polarizer, which is a stretched film or stretched layer to which a dichroic dye is adsorbed.
  • a thermoplastic resin film which will be described later, can be used as the protective film.
  • the linear polarizer and the protective film can be laminated via a later-described bonding layer (third bonding layer).
  • thermoplastic resins constituting thermoplastic resin films include, for example, cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; Polyamide resins such as polyimide resins; Polyolefin resins such as polyethylene, polypropylene, and ethylene/propylene copolymers; Cyclic polyolefin resins having cyclo- and norbornene structures (also referred to as norbornene-based resins); polystyrene resin; polyvinyl alcohol resin and the like.
  • the thermoplastic resin film is preferably a cyclic polyolefin resin film, a cellulose ester resin film, a polyester resin film, or a (meth)acrylic resin film.
  • the thickness of the thermoplastic resin film is usually 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, still more preferably 40 ⁇ m or less, and even more preferably 30 ⁇ m or less. It is usually 5 ⁇ m or more, preferably 10 ⁇ m or more.
  • a hard coat layer may be formed on the thermoplastic resin film.
  • the hard coat layer may be formed on one side of the thermoplastic resin film, or may be formed on both sides.
  • a thermoplastic resin film having improved hardness and scratch resistance can be obtained.
  • the hard coat layer the above description is cited.
  • the polymerizable liquid crystal compound used to form the linear polarizer which is the liquid crystal cured layer, is a compound that has a polymerizable reactive group and exhibits liquid crystallinity.
  • the polymerizable reactive group is a group that participates in a polymerization reaction, and is preferably a photopolymerizable reactive group.
  • a photopolymerizable reactive group refers to a group that can participate in a polymerization reaction by an active radical generated from a photopolymerization initiator, an acid, or the like.
  • photopolymerizable reactive groups examples include vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group and oxetanyl group. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group and an oxetanyl group are preferred, and an acryloyloxy group is more preferred.
  • the type of the polymerizable liquid crystal compound is not particularly limited, and rod-like liquid crystal compounds, discotic liquid crystal compounds, and mixtures thereof can be used.
  • the liquid crystallinity of the polymerizable liquid crystal compound may be either thermotropic liquid crystal or lyotropic liquid crystal, and thermotropic liquid crystal may be classified into nematic liquid crystal or smectic liquid crystal according to the degree of order.
  • the dichroic dye is dispersed and oriented in the cured polymerizable liquid crystal compound.
  • the dichroic dye used in the linear polarizer that is the liquid crystal cured layer one having a maximum absorption wavelength in the range of 300 nm or more and 700 nm or less is preferable.
  • dichroic dyes include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes, and anthraquinone dyes, among which azo dyes are preferred.
  • azo dyes examples include monoazo dyes, bisazo dyes, trisazo dyes, tetrakis azo dyes, and stilbene azo dyes, and preferably bisazo dyes and trisazo dyes.
  • the dichroic dyes may be used alone or in combination of two or more, preferably in combination of three or more. In particular, it is more preferable to combine three or more azo compounds.
  • a part of the dichroic dye may have a reactive group and may have liquid crystallinity.
  • a linear polarizer that is a liquid crystal cured layer is obtained, for example, by coating a linear polarizer-forming composition containing a polymerizable liquid crystal compound and a dichroic dye on an alignment layer formed on a substrate layer, and applying a polymerizable liquid crystal compound.
  • a linear polarizer may be formed by coating the composition for forming a linear polarizer on the substrate layer to form a coating film, and stretching the coating film together with the substrate layer.
  • a substrate layer used to form a linear polarizer may be used as a protective film for the linear polarizer.
  • the material and thickness of the base layer may be the same as the material and thickness of the thermoplastic resin film described above.
  • a composition for forming a linear polarizer containing a polymerizable liquid crystal compound and a dichroic dye, and a method for producing a linear polarizer using this composition are disclosed in JP-A-2013-37353 and JP-A-2013-33249. Examples include those described in publications such as JP-A-2017-83843.
  • the linear polarizer-forming composition further contains additives such as solvents, polymerization initiators, cross-linking agents, leveling agents, antioxidants, plasticizers, and sensitizers. may contain. Each of these components may be used alone or in combination of two or more.
  • the polymerization initiator that may be contained in the composition for forming a linear polarizer is a compound capable of initiating the polymerization reaction of the polymerizable liquid crystal compound.
  • initiators are preferred.
  • photopolymerization initiators capable of generating active radicals or acids by the action of light may be mentioned, and among these, photopolymerization initiators capable of generating radicals by the action of light are preferred.
  • the content of the polymerization initiator is preferably 1 part by mass or more and 10 parts by mass or less, more preferably 3 parts by mass or more and 8 parts by mass or less with respect to 100 parts by mass of the total amount of the polymerizable liquid crystal compound. Within this range, the reaction of the polymerizable group proceeds sufficiently, and the alignment state of the liquid crystal compound is easily stabilized.
  • the thickness of the linear polarizer which is the liquid crystal cured layer, is usually 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, more preferably 1 ⁇ m or more and 5 ⁇ m or less.
  • the linear polarizing plate 2 may be a laminate of a substrate layer and a linear polarizer that is a liquid crystal cured layer. Alternatively, the substrate layer may be peeled away from the linear polarizer.
  • the linear polarizing plate 2 including a linear polarizer that is a liquid crystal cured layer may or may not have an alignment layer.
  • the linear polarizing plate 2 can include a protective film laminated on one side or both sides of a linear polarizer, which is a liquid crystal cured layer.
  • the protective film the thermoplastic resin film described above can be used.
  • the linear polarizer and the protective film can be laminated via a later-described bonding layer (third bonding layer).
  • the linear polarizer which is a liquid crystal cured layer, may have an overcoat layer on one side or both sides for the purpose of protecting the linear polarizer.
  • the overcoat layer can be formed, for example, by applying a composition for forming the overcoat layer on the linear polarizer.
  • Materials constituting the overcoat layer include, for example, photocurable resins and water-soluble polymers. Specifically, (meth)acrylic resins, polyvinyl alcohol-based resins, and the like can be used.
  • Visibility correction polarization degree Py of the linear polarizer is usually 95% or more, preferably 97% or more, more preferably 98% or more, still more preferably 98.7% or more, and even more preferably 99.0% or more. , particularly preferably 99.4% or more, and may be 99.9% or more.
  • the visibility correction polarization degree Py of the linear polarizer may be 99.999% or less or 99.99% or less.
  • the visibility correction polarization degree Py is obtained using a spectrophotometer with an integrating sphere (“V7100” manufactured by JASCO Corporation), and the obtained polarization degree is “JIS Z 8701” 2 degrees field of view (C light source) It can be calculated by performing visibility correction by .
  • Increasing the visibility correction polarization degree Py of the linear polarizer is advantageous in enhancing the antireflection function of the optical laminate. If the visibility correction polarization degree Py is less than 95%, the antireflection function may not be achieved.
  • Visibility correction single transmittance Ty of the linear polarizer is usually 41% or more, preferably 41.1% or more, more preferably 41.2% or more, and may be 42% or more. It may be 5% or more. Visibility correction single transmittance Ty of the linear polarizer is usually 50% or less, may be 48% or less, may be 46% or less, may be 44% or less, and may be 43% or less. may be If the luminosity correction single transmittance Ty is excessively high, the luminosity correction polarization degree Py becomes too low, and the antireflection function of the optical layered body may become insufficient.
  • the luminosity-corrected single transmittance Ty was obtained using a spectrophotometer with an integrating sphere ("V7100" manufactured by Jasco Co., Ltd.). ) to correct visibility.
  • the optical laminate includes a retardation layer 3 having a first retardation layer 3a.
  • the linear polarizing plate 2 and the first retardation layer 3a can be laminated with the second bonding layer 20 interposed therebetween.
  • the retardation layer 3 may have only the first retardation layer 3a, or may have a laminated structure composed of two or more retardation layers. That is, the retardation layer 3 may include one or more retardation layers different from the first retardation layer 3a.
  • the retardation layer 3 may have an overcoat layer that protects its surface, a substrate layer that supports the retardation layer 3, and the like.
  • the first retardation layer 3a is, for example, a ⁇ /4 layer.
  • the combination of the retardation layers of the layers is, in order from the linear polarizing plate 2 side, a combination of a ⁇ / 4 layer and a positive C layer, and a ⁇ / 2 layer. and a ⁇ /4 layer, and a combination of a positive C layer and a ⁇ /4 layer.
  • a bonding layer (fourth bonding layer), which will be described later, can be used for lamination of the retardation layers.
  • the ⁇ /4 layer has an in-plane retardation value Re(550) at a wavelength of 550 nm, usually in the range of 90 nm or more and 220 nm or less, preferably in the range of 100 nm or more and 200 nm or less.
  • the ⁇ /2 layer preferably has an in-plane retardation value Re(550) at a wavelength of 550 nm in the range of 200 nm or more and 300 nm or less.
  • the positive C layer has a retardation value Rth(550) in the thickness direction at a wavelength of 550 nm, which is usually in the range of -170 nm or more and -10 nm or less, preferably in the range of -150 nm or more and -20 nm or less.
  • the retardation layer 3 preferably has a reverse wavelength dispersion property, more preferably has a wavelength dispersion ⁇ of 0.95 or less, and still more preferably has a wavelength dispersion ⁇ of
  • the wavelength dispersion ⁇ is preferably 0.80 or more and 0.93 or less, more preferably 0.80 or more and 0.90 or less, and particularly preferably 0.80 or more and 0.88 or less.
  • the chromatic dispersion ⁇ is the ratio between the in-plane retardation value Re(450) at a wavelength of 450 nm and the in-plane retardation value Re(550) at a wavelength of 550 nm.
  • Wavelength dispersion ⁇ in-plane retardation value Re (450)/in-plane retardation value Re (550)
  • the first retardation layer 3a and other retardation layers may be retardation films formed by stretching the thermoplastic resin film described above, or may be liquid crystal cured layers.
  • the cured liquid crystal layer is a cured layer obtained by polymerizing and curing a polymerizable liquid crystal compound in an aligned state.
  • the retardation layer 3 can contain one or more liquid crystal cured layers, and may contain two or more layers.
  • the polymerizable liquid crystal compound includes a rod-shaped polymerizable liquid crystal compound and a disk-shaped polymerizable liquid crystal compound, and one of them may be used, or a mixture containing both of them may be used.
  • the rod-shaped polymerizable liquid crystal compound is aligned horizontally or vertically with respect to the substrate layer, the optical axis of the polymerizable liquid crystal compound coincides with the long axis direction of the polymerizable liquid crystal compound.
  • the discotic polymerizable liquid crystal compound is oriented, the optical axis of the polymerizable liquid crystal compound exists in a direction orthogonal to the discotic surface of the polymerizable liquid crystal compound.
  • the polymerizable liquid crystal compound may be oriented in a suitable direction.
  • an in-plane retardation is expressed by aligning the optical axis of the polymerizable liquid crystal compound horizontally with respect to the plane of the substrate layer. match the direction.
  • an in-plane retardation is expressed by aligning the optical axis of the polymerizable liquid crystal compound horizontally with respect to the plane of the substrate layer, and in this case, the optical axis and the slow axis are orthogonal to
  • the alignment state of the polymerizable liquid crystal compound can be adjusted by combining the alignment layer and the polymerizable liquid crystal compound.
  • a polymerizable liquid crystal compound is a compound that has at least one polymerizable reactive group and has liquid crystallinity. When two or more polymerizable liquid crystal compounds are used in combination, at least one preferably has two or more polymerizable reactive groups in the molecule.
  • the polymerizable reactive group is a group that participates in a polymerization reaction, and is preferably a photopolymerizable reactive group.
  • a photopolymerizable reactive group refers to a group that can participate in a polymerization reaction by an active radical generated from a photopolymerization initiator, an acid, or the like. Examples of photopolymerizable reactive groups are the same as those described above.
  • the liquid crystallinity of the polymerizable liquid crystal compound may be either thermotropic liquid crystal or lyotropic liquid crystal, and thermotropic liquid crystal may be classified into nematic liquid crystal or smectic liquid crystal according to the degree of order.
  • the optical laminate may contain an alignment layer adjacent to the retardation layer.
  • the orientation layer has an orientation regulating force that orients the polymerizable liquid crystal compound in a desired direction.
  • the alignment layer may be a vertical alignment layer in which the molecular axis of the polymerizable liquid crystal compound is vertically aligned with respect to the base layer, or a horizontal alignment layer in which the molecular axis of the polymerizable liquid crystal compound is horizontally aligned with respect to the base layer. or a tilted alignment layer in which the molecular axis of the polymerizable liquid crystal compound is tilted with respect to the substrate layer.
  • the thickness of the liquid crystal cured layer may be 0.1 ⁇ m or more, 0.5 ⁇ m or more, 1 ⁇ m or more, 2 ⁇ m or more, or 10 ⁇ m or less. is preferable, and may be 8 ⁇ m or less, or may be 5 ⁇ m or less.
  • the cured liquid crystal layer can be formed by applying a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound onto the substrate layer, drying the composition, and polymerizing the polymerizable liquid crystal compound.
  • the composition for forming a liquid crystal layer may be applied onto the alignment layer formed on the substrate layer.
  • the material and thickness of the base layer may be the same as the material and thickness of the thermoplastic resin film described above.
  • the substrate layer may be incorporated in the optical laminate together with the retardation layer which is the liquid crystal cured layer, and the substrate layer is peeled off to form the liquid crystal cured layer alone, or the liquid crystal cured layer and the alignment layer are the optical laminate. may be incorporated into
  • FIG. 6 is a schematic cross-sectional view showing another example of the optical layered body according to the present invention.
  • the optical laminate shown in FIG. 6 includes a laminated film 1, a first bonding layer 10, a linear polarizing plate 2, a second bonding layer 20, a retardation layer 3, and an adhesive layer 50. .
  • the retardation layer 3 preferably has reverse wavelength dispersion.
  • the pressure-sensitive adhesive layer 50 can be laminated on the surface opposite to the viewing side (laminated film 1 side) of the optical layered body, and is used for bonding the optical layered body to an image display element such as an organic EL display element. be able to.
  • the laminated film 1 includes a base film 1b and an optical functional layer (A) 1a laminated thereon.
  • the linear polarizing plate 2 includes a linear polarizer 2b and protective films 2a and 2c laminated on both sides thereof with a third bonding layer 30 interposed therebetween. Either one of the protective films 2a and 2c may be omitted.
  • the retardation layer 3 includes a first retardation layer 3a and a second retardation layer 3b.
  • the optical laminate shown in FIG. 6 includes a first retardation layer 3a and a second retardation layer 3b, which are bonded together by a fourth bonding layer 40. As shown in FIG. However, the fourth bonding layer 40 and the second retardation layer 3b may be omitted.
  • the thickness of the adhesive layer 50 may be, for example, 250 ⁇ m or less, preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less, and still more preferably 40 ⁇ m or less from the viewpoint of thinning. From the viewpoint of durability, the lower limit of the thickness of the pressure-sensitive adhesive layer may be, for example, 1 ⁇ m or more, preferably 5 ⁇ m or more, and more preferably 10 ⁇ m or more.
  • the adhesive layer 50 can be composed of an adhesive composition containing (meth)acrylic resin, rubber resin, urethane resin, ester resin, silicone resin, and polyvinyl ether resin as main components. Among them, a pressure-sensitive adhesive composition using a (meth)acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance, etc., is preferable.
  • the adhesive composition may be active energy ray-curable or heat-curable.
  • the (meth)acrylic resin (base polymer) used in the adhesive composition includes butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and the like. Polymers or copolymers containing one or more of the (meth)acrylic acid esters as monomers are preferably used.
  • the base polymer is copolymerized with a polar monomer.
  • Polar monomers include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N,N-dimethylaminoethyl (meth) acrylate, glycidyl (meth) Monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc., such as acrylates, can be mentioned.
  • the adhesive composition may contain only the above base polymer, but usually further contains a cross-linking agent.
  • a cross-linking agent a metal ion having a valence of 2 or more and forming a carboxylic acid metal salt with a carboxyl group, a polyamine compound forming an amide bond with a carboxyl group, and a carboxyl group
  • examples include polyepoxy compounds or polyols that form ester bonds with and polyisocyanate compounds that form amide bonds with carboxyl groups. Among them, polyisocyanate compounds are preferred.
  • the pressure-sensitive adhesive composition may further contain the ultraviolet absorber described in the explanation of " ⁇ Laminate film> (3) Resin layer" above.
  • the active energy ray-curable pressure-sensitive adhesive composition has the property of being cured by being irradiated with an active energy ray such as an ultraviolet ray or an electron beam. It has the property that it can be adhered to an adherend and can be cured by irradiation with active energy rays to adjust the adhesion force.
  • the active energy ray-curable pressure-sensitive adhesive composition is preferably UV-curable.
  • the active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the cross-linking agent. If necessary, a photopolymerization initiator, a photosensitizer, etc. may be contained.
  • the optical layered body is provided with a separate film 60 for protecting the outer surface of the pressure-sensitive adhesive layer 50 (the surface opposite to the second retardation layer 3b). can be done.
  • the optical layered body shown in FIG. 7 has the same layer structure as the optical layered body shown in FIG. 6 except that it has a separate film 60 .
  • the separate film 60 is usually composed of a thermoplastic resin film whose one side has been subjected to release treatment with a release agent such as silicone or fluorine, and the release-treated surface is attached to the adhesive layer 50 .
  • the thermoplastic resin forming the separate film 60 is, for example, a polyethylene-based resin such as polyethylene, a polypropylene-based resin such as polypropylene, a polyester-based resin such as polyethylene terephthalate or polyethylene naphthalate, or the like.
  • the thickness of the separate film 60 is, for example, 10 ⁇ m or more and 50 ⁇ m or less.
  • the optical layered body may include a protection film 70 laminated on the surface of the layered film 1 side.
  • the optical layered body shown in FIG. 8 has the same layer configuration as the optical layered body shown in FIG. 7 except that the protective film 70 is included.
  • the protection film 70 is composed of, for example, a base film and an adhesive layer laminated thereon.
  • the pressure-sensitive adhesive layer the above description is cited.
  • the resin constituting the base film is, for example, a polyethylene-based resin such as polyethylene, a polypropylene-based resin such as polypropylene, a polyester-based resin such as polyethylene terephthalate or polyethylene naphthalate, or a thermoplastic resin such as a polycarbonate-based resin. be able to. Polyester-based resins such as polyethylene terephthalate are preferred.
  • the optical stack may further include a front plate 90 .
  • the front plate 90 is usually arranged on the outermost surface of the optical layered body on the viewing side.
  • the front plate 90 can be laminated, for example, on the surface of the laminated film 1 on the viewing side with the fifth bonding layer 80 interposed therebetween.
  • the optical layered body shown in FIG. 9 has the same layer configuration as the optical layered body shown in FIG. 7 except that it has the fifth bonding layer 80 and the front plate 90 .
  • the material and thickness of the front plate 90 are not limited as long as it is a plate-like body that can transmit light.
  • the front plate 90 may be composed of only one layer, or may be composed of two or more layers.
  • a plate-like body made of resin eg, a resin plate, a resin sheet, a resin film, etc.
  • a plate-shaped body made of glass eg, a glass plate, a glass film, etc.
  • a plate-shaped body made of resin and a plate-shaped body made of glass A laminate with a plate-shaped body of The front panel can constitute the outermost surface of the display device.
  • the thickness of the front plate 90 is, for example, 1000 ⁇ m or less, preferably 800 ⁇ m or less.
  • the thickness is usually 10 ⁇ m or more, preferably 20 ⁇ m or more.
  • Examples of the resin that constitutes the resin plate-like body include triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, and polyether.
  • thermoplastic resins can be used alone or in combination of two or more.
  • the resin plate is preferably a thermoplastic resin film made of polyimide, polyamide, polyamideimide, or the like.
  • the front plate 90 may be a thermoplastic resin film with a hard coat layer.
  • the hard coat layer may be formed on one side of the thermoplastic resin film, or may be formed on both sides.
  • hardness and scratch resistance can be improved.
  • the hard coat layer the above description is cited.
  • the front plate 90 is a glass plate
  • tempered glass for displays is preferably used as the glass plate.
  • the thickness of the glass plate may be, for example, 10 ⁇ m or more and 1000 ⁇ m or less, or may be 10 ⁇ m or more and 800 ⁇ m or less.
  • the front plate 90 preferably has high rigidity, and has a Young's modulus of, for example, 70 GPa or more, and may be 80 GPa or more.
  • the Young's modulus of the front plate 90 is usually 100 GPa or less. Young's modulus can be measured as follows. A sample for measurement of the front panel 60 having a long side of 110 mm and a short side of 10 mm is cut out using a super cutter. Then, the upper and lower grips of a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-Xplus testing machine) grip both ends of the measurement sample in the long side direction so that the distance between the grips is 5 cm, and the temperature is 23. ° C., under an environment of 55% relative humidity, the stress obtained by pulling in the length direction of the measurement sample at a tensile speed of 4 mm / min. Young's modulus in % can be calculated.
  • a tensile tester manufactured by Shimadzu Corporation, Autograph AG-
  • the fifth bonding layer is used from the viewpoint of making the color unevenness less visible.
  • the refractive index of the composite layer 80 is preferably 1.45 to 1.51, more preferably 1.46 to 1.50, and the front plate 90 preferably has a refractive index of 1.49 to 1.52. It is more preferably 1.50 or more and 1.52 or less.
  • the fifth bonding layer 80 is preferably an adhesive layer.
  • the front plate 90 not only has a function of protecting the front surface (screen) of the image display device (function as a window film), but also functions as a touch sensor. It may have a light cut function, a viewing angle adjustment function, and the like.
  • the optical laminate can include a lamination layer for joining two layers (or films).
  • the bonding layers include a first bonding layer 10 for bonding the laminated film 1 and the linear polarizing plate 2 together, a second bonding layer 20 for bonding the linear polarizing plate 2 and the retardation layer 3 together, and a linear polarizer. 2b and the protective films 2a and 2c, a fourth bonding layer 40 for bonding the first retardation layer 3a and the second retardation layer 3b, and a front plate 90.
  • a fifth bonding layer 80 (which may be regarded as the resin layer 1c included in the laminated film 1) for the purpose of bonding, and the like.
  • the lamination layer is an adhesive layer composed of an adhesive composition or an adhesive layer composed of an adhesive composition.
  • the adhesive composition and the adhesive layer the description of (3) above is cited.
  • adhesive compositions include water-based adhesives and active energy ray-curable adhesives.
  • water-based adhesives include polyvinyl alcohol-based resin aqueous solutions and water-based two-part urethane-based emulsion adhesives.
  • Active energy ray-curable adhesives are adhesives that are cured by irradiation with active energy rays such as ultraviolet rays.
  • adhesives containing a polymerizable compound and a photopolymerization initiator adhesives containing a photoreactive resin , an adhesive containing a binder resin and a photoreactive cross-linking agent, and the like.
  • Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy-based monomers, photocurable (meth)acrylic monomers, and photocurable urethane-based monomers, and oligomers derived from these monomers.
  • Examples of the photopolymerization initiator include compounds containing substances that generate active species such as neutral radicals, anion radicals, and cation radicals upon irradiation with active energy rays such as ultraviolet rays.
  • the thickness of the lamination layer composed of the adhesive composition may be, for example, 0.1 ⁇ m or more, preferably 0.5 ⁇ m or more, 1 ⁇ m or more, or 2 ⁇ m or more, and 100 ⁇ m or less, 50 ⁇ m or less, 25 ⁇ m or less, or 15 ⁇ m. or less or 5 ⁇ m or less.
  • the two opposing surfaces to be bonded via the bonding layer may be previously subjected to surface activation treatment such as corona treatment, plasma treatment, and flame treatment.
  • An image display device includes the optical laminate according to the present invention and an image display element (organic EL display element or the like).
  • the optical layered body is arranged on the viewing side of the image display element.
  • the adhesive layer 50 can be used to bond the optical layered body to an image display element.
  • FIG. 10 is a schematic cross-sectional view showing an example of an image display device according to the present invention.
  • the optical layered body shown in FIG. 9 is used as an example of the optical layered body.
  • the optical layered body is attached to the image display element 100 using the pressure-sensitive adhesive layer 50 .
  • a front plate 90 is laminated via a fifth bonding layer 80 on the surface of the optical laminate opposite to the pressure-sensitive adhesive layer 50 (the outermost surface on the viewing side).
  • the image display device is not particularly limited, and examples thereof include image display devices such as organic electroluminescence (organic EL) display devices, inorganic electroluminescence (inorganic EL) display devices, liquid crystal display devices, and electroluminescence display devices.
  • image display devices such as organic electroluminescence (organic EL) display devices, inorganic electroluminescence (inorganic EL) display devices, liquid crystal display devices, and electroluminescence display devices.
  • the image display device can be used as mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signboards, measuring instruments or gauges, office equipment, medical equipment, computing equipment, and the like.
  • Luminous reflectance Y and reflection hue (a* and b*) of laminated film First, using a spectrophotometer "MPC-2200" manufactured by Shimadzu Corporation, the reflectance in the visible light region was measured. During the measurement, a black acrylic plate (“Kanacelite 1410” manufactured by Kanase Co., Ltd.) was attached to the back side of the measurement surface via an adhesive layer. Luminous reflectance Y and reflection hue (a* and b*) were calculated from the obtained reflection spectrum. The luminous reflectance was calculated by multiplying the obtained reflectance Y by a luminosity coefficient.
  • Retardation Characteristics of Retardation Layer The retardation characteristics of the retardation layer were measured using “KOBRA-WPR” manufactured by Oji Scientific Instruments.
  • Irgacure 184" manufactured by BASF
  • An ultraviolet curable resin (“KAYARAD-DPHA” manufactured by Nippon Kayaku Co., Ltd.) was added thereto and stirred.
  • ZRMIBK15WT%-P03 manufactured by CIK Nanotech, solid content 15% by mass, average primary particle size 7.8 nm
  • ZRMIBK15WT%-P03 manufactured by CIK Nanotech, solid content 15% by mass, average primary particle size 7.8 nm
  • the ratio of the particle size range of 0.1 nm to 15 nm to the total was 99.56%.
  • a polyvinyl alcohol aqueous solution was prepared by dissolving 3 parts by mass of carboxyl group-modified polyvinyl alcohol ["KL-318" manufactured by Kuraray Co., Ltd.] in 100 parts by mass of water.
  • Water-soluble polyamide epoxy resin (“Sumireze Resin 650 (30)” manufactured by Taoka Chemical Co., Ltd., solid content concentration 30% by mass) was added to the resulting aqueous solution, and 1.5 parts by mass was added to 100 parts by mass of water. The proportions were mixed to obtain a water-based adhesive.
  • the water-based adhesive obtained above is applied to one surface of the linear polarizer obtained above, and a cyclic polyolefin resin film (hereinafter referred to as a hard coat layer (hereinafter also referred to as “HC layer”) having a hard coat layer (hereinafter referred to as "HC layer”) Also referred to as "COP film”.), apply the water-based adhesive obtained above to the other surface of the linear polarizer, laminate the TAC film, and dry at a temperature of 80 ° C. for 5 minutes. , a linear polarizing plate having protective films on both sides of the linear polarizer was obtained.
  • HC layer cyclic polyolefin resin film
  • the layer structure of the linear polarizing plate is HC layer/COP film/water-based adhesive layer/linear polarizer/water-based adhesive layer/TAC film.
  • a protective film having an adhesive layer on a base film was laminated on the HC layer of the linear polarizing plate to obtain a linear polarizing plate with a protective film (hereinafter also referred to as "linear polarizing plate with PF").
  • Retardation Layer Laminate An orientation layer is formed on the first substrate layer made of a transparent resin, and a composition for forming a liquid crystal layer containing a rod-shaped nematic polymerizable liquid crystal compound is applied to form the first substrate layer.
  • a first retardation layer with a substrate layer was produced.
  • the first retardation layer was a ⁇ /4 layer.
  • the thickness of the first retardation layer was 2 ⁇ m.
  • the wavelength dispersion ⁇ [in-plane retardation value Re(450)/in-plane retardation value Re(550)] of the first retardation layer was 0.85, and Re(550) was 142 nm. Details are shown below.
  • Photo-orientable material :
  • a polymerizable liquid crystal compound (A1) and a polymerizable liquid crystal compound (A2) having the structures shown below were prepared.
  • a polymerizable liquid crystal compound (A1) was prepared in the same manner as described in JP-A-2019-003177.
  • a polymerizable liquid crystal compound (A2) was prepared in the same manner as described in JP-A-2009-173893.
  • a solution was obtained by dissolving 1 mg of the polymerizable liquid crystal compound (A1) in 10 mL of chloroform.
  • a measurement sample was placed in a measurement cell having an optical path length of 1 cm, and the measurement sample was set in an ultraviolet-visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation) to measure the absorption spectrum.
  • UV-2450 ultraviolet-visible spectrophotometer
  • the maximum absorption wavelength ⁇ max in the wavelength range of 300 to 400 nm was 356 nm.
  • a biaxially stretched polyethylene terephthalate (PET) film (Diafoil, manufactured by Mitsubishi Plastics Co., Ltd.) as the first substrate layer was coated with the composition for forming an orientation layer using a bar coater. The resulting coating film was dried at 120° C. for 2 minutes and then cooled to room temperature to form a dry film. Thereafter, a UV irradiation device (SPOT CURE SP-9; manufactured by Ushio Inc.) was used to irradiate 100 mJ (313 nm standard) of polarized ultraviolet light to obtain an alignment layer. The thickness of the alignment layer measured using an ellipsometer M-220 manufactured by JASCO Corporation was 100 nm.
  • SPOT CURE SP-9 manufactured by Ushio Inc.
  • the composition for forming the first retardation layer was applied using a bar coater to form a coating film.
  • This coating film was dried by heating at 120° C. for 2 minutes and then cooled to room temperature to obtain a dry film. Then, using a high-pressure mercury lamp (“Unicure VB-15201BY-A” manufactured by Ushio Inc.), the dry film is irradiated with ultraviolet light at an exposure amount of 500 mJ/cm 2 (365 nm standard) in a nitrogen atmosphere.
  • the first substrate layer / alignment layer / first retardation layer (horizontally aligned liquid crystal A cured film) was thus obtained.
  • the film thickness of the first retardation layer measured using a laser microscope LEXT OLS4100 manufactured by Olympus Corporation was 2.0 ⁇ m.
  • a second retardation layer with a second base layer was produced by the following method.
  • a composition for forming an alignment layer was obtained by adding 2-butoxyethanol to Sanever SE-610 (manufactured by Nissan Chemical Industries, Ltd.), which is a commercially available alignment polymer, so that the solid content was 1% by mass.
  • Second Retardation Layer As the second base material layer, a cycloolefin polymer (COP) (ZF14, manufactured by Nippon Zeon Co., Ltd.) was used, and one side thereof was subjected to corona treatment using a corona treatment device (AGF-B10; manufactured by Kasuga Denki Co., Ltd.). , the alignment layer-forming composition was applied to the surface thereof using a bar coater and dried at 90°C for 1 minute. The film thickness of the resulting alignment layer was measured with a laser microscope and found to be 30 nm. Subsequently, the composition for forming the second retardation layer was applied onto the alignment layer using a bar coater and dried at 90° C. for 1 minute.
  • COP cycloolefin polymer
  • a second retardation layer with a second base layer was obtained by irradiating the dry film with ultraviolet light at an exposure amount of 1000 mJ/cm 2 (365 nm standard) in a nitrogen atmosphere.
  • the film thickness was measured with a laser microscope, the film thickness of the second retardation layer was 450 nm.
  • the in-plane retardation value was measured using KOBRA-WR manufactured by Oji Scientific Instruments Co., Ltd.
  • a UV-curable adhesive was prepared by mixing cationic curable components shown below.
  • 3′,4′-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate (trade name: CEL2021P, manufactured by Daicel Corporation): 70 parts by mass
  • Neopentyl glycol diglycidyl ether (trade name: EX-211, Nagase ChemteX Corporation) Company): 20 parts by weight 2-ethylhexyl glycidyl ether (trade name: EX-121, manufactured by Nagase ChemteX Corporation): 10 parts by weight Cationic polymerization initiator (trade name: CPI-100, 50% solution, San-Apro Co., Ltd. made): 4.5 parts by mass (substantial solid content: 2.25 parts by mass) 1,4-diethoxynaphthalene: 2.0 parts by mass
  • the retardation layer side of the first retardation layer with the first substrate layer and the retardation layer side of the second retardation layer with the second substrate layer were each subjected to corona treatment.
  • the prepared ultraviolet curable adhesive was applied to one corona-treated surface, and the first retardation layer with the first base layer and the second retardation layer with the second base layer were bonded together.
  • An adhesive layer was formed by irradiating ultraviolet rays from the second base material layer side to cure the ultraviolet curing adhesive.
  • the thickness of the UV curable adhesive layer after curing was 1.5 ⁇ m.
  • the reflectance Y of the optical layered body was evaluated according to the following criteria. Table 1 shows the results. A: Reflectance Y is 5.5% or less. B: Reflectance Y is over 5.5%.
  • Example 2 to 4 (1) Production of laminated film A laminated film was produced in the same manner as in Example 1 except that the optical film thickness of the optical function layer (high refractive index layer) was as shown in Table 1 (same as in Example 1 using a composition for forming a high refractive index layer). Table 1 shows the refractive index of the optical functional layer, and the luminous reflectance Y and reflection hue of the laminated film.
  • ZRMIBK15WT%-P03 zirconium oxide particle dispersion
  • solid content 15% by mass, average primary particle diameter 7.8 nm
  • the composition for forming a low refractive index layer prepared in (1-2) above is applied using a bar coater, dried and irradiated with ultraviolet rays to form a low refractive index layer,
  • a laminated film was prepared from the material film and optical functional layers (high refractive index layer and low refractive index layer) having optical film thicknesses shown in Table 1.
  • Table 1 shows the refractive index of the optical functional layer, and the luminous reflectance Y and reflection hue of the laminated film.
  • the numerical value of the optical film thickness of the optical function layer in Comparative Examples 9 and 10 indicates the optical film thickness of the high refractive index layer/the optical film thickness of the low refractive index layer.
  • the numerical value of the refractive index of the optical functional layer in Comparative Examples 9 and 10 indicates the refractive index of the high refractive index layer/the refractive index of the low refractive index layer.
  • Laminated film 1a Optical function layer (A) 1b Base film 1c Resin layer 1d Intervening layer 2 Linear polarizing plate 2a, 2c Protective film 2b Linear polarizer 3 Retardation layer 3a First place Retardation layer 3b Second retardation layer 10 First bonding layer 20 Second bonding layer 30 Third bonding layer 40 Fourth bonding layer 50 Adhesive layer 60 Separate film 70 Protection film , 80 fifth bonding layer, 90 front plate, 100 image display element.
  • Base film 1c Resin layer 1d Intervening layer 2 Linear polarizing plate 2a, 2c Protective film 2b Linear polarizer 3 Retardation layer 3a First place Retardation layer 3b Second retardation layer 10 First bonding layer 20 Second bonding layer 30 Third bonding layer 40 Fourth bonding layer 50 Adhesive layer 60 Separate film 70 Protection film , 80 fifth bonding layer, 90 front plate, 100 image display element.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un film stratifié comprenant un film de base et une couche fonctionnelle optique (A) stratifiée sur celle-ci, la réflectance perceptuelle Y étant inférieure ou égale à 9,0 %, la teinte de réflexion a* étant de 0,3 à 7,0 et la teinte de réflexion b* étant de 10,0 à 0. L'invention concerne également un stratifié optique qui comprend ledit film stratifié et une plaque de polarisation circulaire, et un dispositif d'affichage d'image qui contient ledit stratifié optique.
PCT/JP2022/036149 2021-10-01 2022-09-28 Film stratifié, stratifié optique et dispositif d'affichage d'image WO2023054463A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010152056A (ja) * 2008-12-25 2010-07-08 Toppan Printing Co Ltd 反射防止フィルム及び反射防止フィルムを有する偏光板並びに画像表示装置
JP2013097356A (ja) * 2011-11-07 2013-05-20 Toppan Printing Co Ltd 反射防止フィルム製造方法、反射防止フィルム、偏光板、および表示装置
JP2013097562A (ja) * 2011-10-31 2013-05-20 Teijin Dupont Films Japan Ltd 静電容量方式タッチパネル電極用積層体
WO2018110503A1 (fr) * 2016-12-12 2018-06-21 日東電工株式会社 Plaque polarisante circulaire
WO2019124347A1 (fr) * 2017-12-22 2019-06-27 大日本印刷株式会社 Stratifié optique, écran d'affichage, et dispositif d'affichage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010152056A (ja) * 2008-12-25 2010-07-08 Toppan Printing Co Ltd 反射防止フィルム及び反射防止フィルムを有する偏光板並びに画像表示装置
JP2013097562A (ja) * 2011-10-31 2013-05-20 Teijin Dupont Films Japan Ltd 静電容量方式タッチパネル電極用積層体
JP2013097356A (ja) * 2011-11-07 2013-05-20 Toppan Printing Co Ltd 反射防止フィルム製造方法、反射防止フィルム、偏光板、および表示装置
WO2018110503A1 (fr) * 2016-12-12 2018-06-21 日東電工株式会社 Plaque polarisante circulaire
WO2019124347A1 (fr) * 2017-12-22 2019-06-27 大日本印刷株式会社 Stratifié optique, écran d'affichage, et dispositif d'affichage

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